Resolved Trouble connecting ASUS PB278QR to iMac

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i bought new 27" asus pb278qr monitor imac (27-inch, mid 2011) thunderbolt.

had mini displayport dvi adapter when use that, 1920x1080 resolution , not expected 2560x1440. have learned due adapter being single link dvi. fair enough!

bought hdmi mini display port cable @ apple. worked worse. i'm not sure resolution was. picture looked terrible. returned cable.

bought mini-displayport adapter cable. did not work @ all. when plug in, monitor goes black, shows picture half second, goes black again. there nasty noise speakers.

called store , send me cable of same type. have yet receive it. must doubtful. have experience connecting 2560x1440 non-tunderbolt monitor thunderbolt mac? cable did use?
 

i received replacement cable. , works now! guess faulty cable.
 


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